sm8450-common: Unset BOARD_USERDATAIMAGE_PARTITION_SIZE

This not only saves a lot of build time when building with
TARGET_USERIMAGES_SPARSE_EXT_DISABLED and/or
TARGET_USERIMAGES_SPARSE_F2FS_DISABLED which is required
on A14, but also removes the need for the build system to
temporarily create a 40+GB userdata image.
Which means that less free space is required to start the
build.

Change-Id: Ibf48e7cdf566a4653e85352a79170b354d917234

BoardConfigCommon.mk

@@ -164,7 +164,6 @@ BOARD_BOOTIMAGE_PARTITION_SIZE := 0x0C000000
 BOARD_DTBOIMG_PARTITION_SIZE := 0x01800000
 BOARD_RECOVERYIMAGE_PARTITION_SIZE := 0x06400000
 BOARD_SUPER_PARTITION_SIZE := 9126805504 # 0x220000000
-BOARD_USERDATAIMAGE_PARTITION_SIZE := 239033364480 # 0x37A77FB000
 BOARD_VENDOR_BOOTIMAGE_PARTITION_SIZE := 0x06000000
 
 BOARD_SUPER_PARTITION_GROUPS := qti_dynamic_partitions